/**
 * Copyright 2011-2019 Asakusa Framework Team.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.asakusafw.lang.compiler.inspection;

import java.util.HashMap;
import java.util.Map;

class Counter {

    private final Map<String, Entry> entries = new HashMap<>();

    public String fetchId(String key) {
        return String.format("%s-%d", key, fetchSerial(key)); //$NON-NLS-1$
    }

    public int fetchSerial(String key) {
        Entry entry = entries.get(key);
        if (entry == null) {
            entry = new Entry();
            entries.put(key, entry);
        }
        return entry.value++;
    }

    private static class Entry {

        int value;

        Entry() {
            return;
        }
    }
}
